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The Current Employment Statistics (CES) sample is a stratified, simple random sample of worksites, clustered by Unemployment Insurance (UI) account number.The UI account number is a major identifier on the Bureau of Labor Statistics (BLS) Longitudinal Database (LDB) of employer records, which serves as both the sampling frame and the benchmark source for the CES employment estimates.Employers who have multiple establishments within a state usually report data for each individual establishment.The LDB tracks establishments over time and links them from quarter to quarter.

The LDB is the universe from which CES draws the establishment survey sample. The Quarterly Census of Employment and Wages (QCEW) program collects these data from employers on a quarterly basis in cooperation with Labor Market Information Agencies (LMIs).Optimum allocation minimizes variance at a fixed cost or minimizes cost for a fixed variance.Under the CES probability design, a fixed number of sample units for each state is distributed across the allocation strata in such a way as to minimize the overall variance, or sampling error, of the total state employment level.With 13 industries (treating manufacturing as one industry and not including government) and 8 size classes, there are 104 total allocation cells per state.The sampling rate for each stratum is determined through a method known as optimum allocation.Within each allocation cell, units are grouped by metropolitan statistical area (MSA), and these MSAs are sorted by the size of the MSA, defined as the number of UI accounts in that MSA.As the sampling rate is uniform across the entire allocation cell, implicit stratification by MSA ensures that a proportional number of units are sampled from each MSA.The Bureau of Labor Statistics (BLS) collects data each month on employment, hours, and earnings from a sample of nonfarm establishments through the Current Employment Statistics (CES) program.The CES survey includes about 149,000 businesses and government agencies, which cover approximately 651,000 individual worksites drawn from a sampling frame of Unemployment Insurance (UI) tax accounts covering roughly 9.9 million establishments.A birth update is added in the early summer from the third quarter of the previous year.After all out-of-scope records are removed, the sampling frame is separated into allocation cells.

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